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Electrons are emitted from a conductor when the conductor is

Asubjected to a small voltage.
Bbombarded by high-speed electrons.
Ccooled rapidly.
Dexposed to weak light.

Verified Answer :

RASEA23
BBombarded by high speed electrons. 
There are already electrons with potential energy in the conductor. When it is bombarded by these high speed electrons, the potential energy is changed into kinetic energy and then the electrons are emitted from the conductor.
Hope this helps.

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